Insufficient boundary checks when processing a string in mb_ereg_replace allows access to out-of-bounds memory. This issue affects HHVM versions prior to 3.30.12, all versions between 4.0.0 and 4.8.5, all versions between 4.9.0 and 4.23.1, as well as 4.24.0, 4.25.0, 4.26.0, 4.27.0, 4.28.0, and 4.28.1.
The product reads data past the end, or before the beginning, of the intended buffer.
The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer, leading to a buffer overflow.
| Link | Tags |
|---|---|
| https://hhvm.com/blog/2019/10/28/security-update.html | vendor advisory |
| https://github.com/facebook/hhvm/commit/1c518555dba6ceb45d5ba61845b96e261219c3b7 | third party advisory patch |
| https://www.facebook.com/security/advisories/cve-2019-11935 | vendor advisory |